It's amazing how far I've come since last working on my as of yet unnamed Project 3 (I suck so much at naming things...) just 5 years ago. My style has changed twice since then, I've learned new tricks, I've gotten much faster, and a lot more confident.
I remember not understanding what I was doing wrong. I was slow, my pixel art was ugly, and a had a huge lack of techniques as my disposal. I remember constantly being depressed about it, which only hurt my ability to progress. I would fall into days and weeks of severe depression because I couldn't do what I wanted to do. I couldn't do what I can do now.
I have to go back and redraw all of the sprite assets, but what once took me about a year to do is now only taking me close to a month. I still have much more to do, because the game is going to be much larger than it was, at the time, but I couldn't help but look at all the old assets and notice what worked, what didn't work, what looked great, and what looked awful.
I'm actually glad I wasn't able to complete the game, because it would have been absolutely horrific.